Hi, I saw a one-off failure like this:
QUERY PLAN -------------------------------------------------------------------------- Aggregate (actual rows=1 loops=1) ! -> Nested Loop (actual rows=98000 loops=1) -> Seq Scan on tenk2 (actual rows=10 loops=1) Filter: (thousand = 0) Rows Removed by Filter: 9990 ! -> Gather (actual rows=9800 loops=10) Workers Planned: 4 Workers Launched: 4 -> Parallel Seq Scan on tenk1 (actual rows=1960 loops=50) --- 485,495 ---- QUERY PLAN -------------------------------------------------------------------------- Aggregate (actual rows=1 loops=1) ! -> Nested Loop (actual rows=97984 loops=1) -> Seq Scan on tenk2 (actual rows=10 loops=1) Filter: (thousand = 0) Rows Removed by Filter: 9990 ! -> Gather (actual rows=9798 loops=10) Workers Planned: 4 Workers Launched: 4 -> Parallel Seq Scan on tenk1 (actual rows=1960 loops=50) Two tuples apparently went missing. Similar failures on the build farm: https://buildfarm.postgresql.org/cgi-bin/show_log.pl?nm=okapi&dt=2018-03-03%2020%3A15%3A01 https://buildfarm.postgresql.org/cgi-bin/show_log.pl?nm=locust&dt=2018-03-03%2018%3A13%3A32 https://buildfarm.postgresql.org/cgi-bin/show_log.pl?nm=prairiedog&dt=2018-03-03%2017%3A55%3A11 Could this be related to commit 34db06ef9a1d7f36391c64293bf1e0ce44a33915 or commit 497171d3e2aaeea3b30d710b4e368645ad07ae43? -- Thomas Munro http://www.enterprisedb.com